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mirror of https://github.com/v2fly/v2ray-core.git synced 2024-06-10 09:50:43 +00:00
v2fly/proxy/http/server.go
2017-01-13 00:56:21 +01:00

302 lines
7.8 KiB
Go

package http
import (
"io"
"net"
"net/http"
"strconv"
"strings"
"sync"
"context"
"v2ray.com/core/app"
"v2ray.com/core/app/dispatcher"
"v2ray.com/core/common"
"v2ray.com/core/common/buf"
"v2ray.com/core/common/bufio"
"v2ray.com/core/common/errors"
"v2ray.com/core/common/log"
v2net "v2ray.com/core/common/net"
"v2ray.com/core/common/signal"
"v2ray.com/core/proxy"
"v2ray.com/core/transport/internet"
)
// Server is a HTTP proxy server.
type Server struct {
sync.Mutex
accepting bool
packetDispatcher dispatcher.PacketDispatcher
config *ServerConfig
tcpListener *internet.TCPHub
meta *proxy.InboundHandlerMeta
}
// NewServer creates a new HTTP inbound handler.
func NewServer(ctx context.Context, config *ServerConfig) (*Server, error) {
space := app.SpaceFromContext(ctx)
if space == nil {
return nil, errors.New("HTTP|Server: No space in context.")
}
meta := proxy.InboundMetaFromContext(ctx)
if meta == nil {
return nil, errors.New("HTTP|Server: No inbound meta from context.")
}
s := &Server{
config: config,
meta: meta,
}
space.OnInitialize(func() error {
s.packetDispatcher = dispatcher.FromSpace(space)
if s.packetDispatcher == nil {
return errors.New("HTTP|Server: Dispatcher not found in space.")
}
return nil
})
return s, nil
}
// Port implements InboundHandler.Port().
func (v *Server) Port() v2net.Port {
return v.meta.Port
}
// Close implements InboundHandler.Close().
func (v *Server) Close() {
v.accepting = false
if v.tcpListener != nil {
v.Lock()
v.tcpListener.Close()
v.tcpListener = nil
v.Unlock()
}
}
// Start implements InboundHandler.Start().
func (v *Server) Start() error {
if v.accepting {
return nil
}
tcpListener, err := internet.ListenTCP(v.meta.Address, v.meta.Port, v.handleConnection, v.meta.StreamSettings)
if err != nil {
log.Error("HTTP: Failed listen on ", v.meta.Address, ":", v.meta.Port, ": ", err)
return err
}
v.Lock()
v.tcpListener = tcpListener
v.Unlock()
v.accepting = true
return nil
}
func parseHost(rawHost string, defaultPort v2net.Port) (v2net.Destination, error) {
port := defaultPort
host, rawPort, err := net.SplitHostPort(rawHost)
if err != nil {
if addrError, ok := err.(*net.AddrError); ok && strings.Contains(addrError.Err, "missing port") {
host = rawHost
} else {
return v2net.Destination{}, err
}
} else {
intPort, err := strconv.Atoi(rawPort)
if err != nil {
return v2net.Destination{}, err
}
port = v2net.Port(intPort)
}
if ip := net.ParseIP(host); ip != nil {
return v2net.TCPDestination(v2net.IPAddress(ip), port), nil
}
return v2net.TCPDestination(v2net.DomainAddress(host), port), nil
}
func (v *Server) handleConnection(conn internet.Connection) {
defer conn.Close()
conn.SetReusable(false)
timedReader := v2net.NewTimeOutReader(v.config.Timeout, conn)
reader := bufio.OriginalReaderSize(timedReader, 2048)
request, err := http.ReadRequest(reader)
if err != nil {
if errors.Cause(err) != io.EOF {
log.Warning("HTTP: Failed to read http request: ", err)
}
return
}
log.Info("HTTP: Request to Method [", request.Method, "] Host [", request.Host, "] with URL [", request.URL, "]")
defaultPort := v2net.Port(80)
if strings.ToLower(request.URL.Scheme) == "https" {
defaultPort = v2net.Port(443)
}
host := request.Host
if len(host) == 0 {
host = request.URL.Host
}
dest, err := parseHost(host, defaultPort)
if err != nil {
log.Warning("HTTP: Malformed proxy host (", host, "): ", err)
return
}
log.Access(conn.RemoteAddr(), request.URL, log.AccessAccepted, "")
session := &proxy.SessionInfo{
Source: v2net.DestinationFromAddr(conn.RemoteAddr()),
Destination: dest,
Inbound: v.meta,
}
if strings.ToUpper(request.Method) == "CONNECT" {
v.handleConnect(request, session, reader, conn)
} else {
v.handlePlainHTTP(request, session, reader, conn)
}
}
func (v *Server) handleConnect(request *http.Request, session *proxy.SessionInfo, reader io.Reader, writer io.Writer) {
response := &http.Response{
Status: "200 OK",
StatusCode: 200,
Proto: "HTTP/1.1",
ProtoMajor: 1,
ProtoMinor: 1,
Header: http.Header(make(map[string][]string)),
Body: nil,
ContentLength: 0,
Close: false,
}
if err := response.Write(writer); err != nil {
log.Warning("HTTP|Server: failed to write back OK response: ", err)
return
}
ray := v.packetDispatcher.DispatchToOutbound(session)
requestDone := signal.ExecuteAsync(func() error {
defer ray.InboundInput().Close()
v2reader := buf.NewReader(reader)
if err := buf.PipeUntilEOF(v2reader, ray.InboundInput()); err != nil {
return err
}
return nil
})
responseDone := signal.ExecuteAsync(func() error {
v2writer := buf.NewWriter(writer)
if err := buf.PipeUntilEOF(ray.InboundOutput(), v2writer); err != nil {
return err
}
return nil
})
if err := signal.ErrorOrFinish2(requestDone, responseDone); err != nil {
log.Info("HTTP|Server: Connection ends with: ", err)
ray.InboundInput().CloseError()
ray.InboundOutput().CloseError()
}
}
// @VisibleForTesting
func StripHopByHopHeaders(request *http.Request) {
// Strip hop-by-hop header basaed on RFC:
// http://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html#sec13.5.1
// https://www.mnot.net/blog/2011/07/11/what_proxies_must_do
request.Header.Del("Proxy-Connection")
request.Header.Del("Proxy-Authenticate")
request.Header.Del("Proxy-Authorization")
request.Header.Del("TE")
request.Header.Del("Trailers")
request.Header.Del("Transfer-Encoding")
request.Header.Del("Upgrade")
// TODO: support keep-alive
connections := request.Header.Get("Connection")
request.Header.Set("Connection", "close")
if len(connections) == 0 {
return
}
for _, h := range strings.Split(connections, ",") {
request.Header.Del(strings.TrimSpace(h))
}
}
func (v *Server) GenerateResponse(statusCode int, status string) *http.Response {
hdr := http.Header(make(map[string][]string))
hdr.Set("Connection", "close")
return &http.Response{
Status: status,
StatusCode: statusCode,
Proto: "HTTP/1.1",
ProtoMajor: 1,
ProtoMinor: 1,
Header: hdr,
Body: nil,
ContentLength: 0,
Close: true,
}
}
func (v *Server) handlePlainHTTP(request *http.Request, session *proxy.SessionInfo, reader io.Reader, writer io.Writer) {
if len(request.URL.Host) <= 0 {
response := v.GenerateResponse(400, "Bad Request")
response.Write(writer)
return
}
request.Host = request.URL.Host
StripHopByHopHeaders(request)
ray := v.packetDispatcher.DispatchToOutbound(session)
input := ray.InboundInput()
output := ray.InboundOutput()
requestDone := signal.ExecuteAsync(func() error {
defer input.Close()
requestWriter := bufio.NewWriter(buf.NewBytesWriter(ray.InboundInput()))
err := request.Write(requestWriter)
if err != nil {
return err
}
if err := requestWriter.Flush(); err != nil {
return err
}
return nil
})
responseDone := signal.ExecuteAsync(func() error {
responseReader := bufio.OriginalReader(buf.NewBytesReader(ray.InboundOutput()))
response, err := http.ReadResponse(responseReader, request)
if err != nil {
log.Warning("HTTP: Failed to read response: ", err)
response = v.GenerateResponse(503, "Service Unavailable")
}
responseWriter := bufio.NewWriter(writer)
if err := response.Write(responseWriter); err != nil {
return err
}
if err := responseWriter.Flush(); err != nil {
return err
}
return nil
})
if err := signal.ErrorOrFinish2(requestDone, responseDone); err != nil {
log.Info("HTTP|Server: Connecton ending with ", err)
input.CloseError()
output.CloseError()
}
}
func init() {
common.Must(common.RegisterConfig((*ServerConfig)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
return NewServer(ctx, config.(*ServerConfig))
}))
}